That's because you are one of the good ones
It's a pretty common thing really if you work in security (either white or black). One of the first things someone will do if they want to access your site, is to gather as much info as they can...that includes checking your hosting, finding your Admin, finding out what CMS/Shopping you are using and what version, etc.
Just remember to always change the default admin URL if you are using a popular CMS/Shop/Blog and if you are using a custom one, put the Admin under a weird URL.
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